Quectel M12 User Manual

M12 Hardware Design
M12_Hardware_Design_V3.3 - 50 -
Table 12: Typical speaker characteristic
Parameter
Min
Typ
Max
Unit
Normal
Output(SPK1)
Single
Ended
Load resistance
28
32
Ohm
Ref level
0
2.4
Vpp
Differential
Load resistance
28
32
Ohm
Ref level
0
4.8
Vpp
Auxiliary
Output(SPK2)
Single
Ended
Load resistance
16
32
Ohm
Ref level
0
2.4
Vpp
Maxim driving
current limit of
SPK1 and SPK2
50
mA
3.10. SIM card interface
3.10.1. SIM card application
The SIM interface supports the functionality of the GSM Phase 1 specification and also supports
the functionality of the new GSM Phase 2+ specification for FAST 64 kbps SIM card, which is
intended for use with a SIM application Tool-kit
The SIM interface is powered from an internal regulator in the module. Both 1.8V and 3.0V SIM
Cards are supported.
Table 13: Pin definition of the SIM interface
Figure 33 is the reference circuit for SIM interface, and here an 8-pin SIM card holder is used.
The pin SIM_PRESENCE is used to detect whether the tray of the Molex SIM socket, which is
used for holding SIM card, is present in the card socket. When the tray is inserted in the socket,
SIM_PRESENCE is at low level. Regardless of the SIM card is in the tray or not, the change of
SIM_PRESENCE level from high to low level prompts the module to reinitialize SIM card. In
Name
Pin
Function
SIM_VDD
12
Supply power for SIM Card. Automatic detection of
SIM card voltage. 3.0V±10% and 1.8V±10%.
Maximum supply current is around 10mA.
SIM_DATA
13
SIM Card data I/O
SIM_CLK
14
SIM Card Clock
SIM_RST
15
SIM Card Reset
SIM_PRESENCE
11
SIM Card Presence
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Quectel M12 Specifications

General

Brand	Quectel
Model	M12
Category	Control Unit
Language	English